The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1887-02-12
MAN MUST LEARN TO SEE
HOW OPTICAL ILLUSIONS ARE PRO-
DUCED IN PANORAMAS.


sense of sight natural?" exclaimed the re-
porter in surprise. The oculist, who had
been charging upon optical decisions, re-
piled with a smile
Sounds queer, does it not? Well, the
sense Of sight is Unborn to a certain ex-
tent, but then so is walking. Still, if the
child does not learn to walk it will never
be able to do it. The eye undoubtedly
acts quicker and at an earlier stage in
life upon exterior things, and is one OF the
first means to enlighten the growing
piece of humanity about the world; yet 1t
must be trained TO do its work we'll. In
other words, man has to learn to see as
well as to walk. The eye is the busiest
organ in the human economy. 1t does not
only inform the intelligent conception
about space and time and atmospheric
conditions and gravitation-tO certain
degree it represents sound, for readlng1s
nothing else than hearing with the eyes.
You see the words and their sound Is
mentally present to you. 1t is certain
that external impressions are at first al
together indistinct to ne newborn babe;
it has not yet learn 81 10 make mental
notes of the picturr GA the retina of its
eye. But then tn Impressions of touch
and movements % hand in hand with the
impression of s. ing things, and by and
by the child d t-nguishes what is within
and without )u top and below, right and
left The pc CeDtiOn of distances is one Of
the last thin = the eye learns to under
stand, but iii the best-trained eye is fire.
quently sui ject TO optical illusions in the
matter of distances
=. MODERN PANORAMA.
"You enter modern panorama and
your eye--that is your sense of seeing
is almost forced to believe in the reality
of what you see. You look in an almost
endless horizon, upon the episodes of
battle between thousands of men, many
of whom you recognize; you are moved by
the dying moments of one mortally
wounded; you are enthused over the cOur-
age of the advancing troops and feel like
jumping over the barriers into the seem
ing imitless plain to be closer to the
scenes of battle. You see in the fore
ground the knapsacks, muskets, guns,
the Withered vegetation. the undulating
ground, and far, far in the background
the line where the horizon and life join,
cutting off from sight what is beyond.
Everything is 50 natural, so realistic.
For awhile you try to fix the line be-
tween body and space, reality and pict-
ure, but you soon give it up and are salts
fed with the illusion. You do not even
think of the quietude of the surround
ings, the mysterious stiffness which rests
over the fighting armies, the burning
buildings, and the laundering cannon.
The optical illusion is complete.
"There are so-called local signs in sight
which the painter of panorama picture
has to study carefully in order to be sue
cessfuL FRS t, the eye brings the size of
the impression upon the retina into pro-
portion to the distance; then the lens &C
commodities itself to the distance; then
comes the color OBSERVATION-DISCLOSURES arti-
cles being indistinct, the nearer ones
plain; then the comparison Of the object
to be seen with objects intervening. If
you, for instance, compare distant tree
with one near at hand, you do not calcu-
late upon the size of the former actually
seen by you, but compare it mentally
with the size of the one next to you.
AFTER sENTURIEs OF EFFORT.
The first artists painted things as they
thought them to be-that is, as they
would be able to perceive them by the
sense OF touching. After centuries of eff
forts the dimension and color perspectives
was invented, and the effects of these are
employed in the panorama with great
shrewdness and very subtle observation Of
nature. The perspectives of dimensions
and COlOrS are so calculated that the OBJ
server has little or no measure for reality.
The canvas is as far removed from the
eye of the observer as possible, and cOnse-
quently the eye is compelled to accom-
modate itself to distance, an operation
WHICH REQUIRES IlEilUdl WOIh anu pans
| criticism There is no frame to the pict-
ure, and in stretching the canvas care is
| taken to avoid any creases which would
offer point of vantage to the eye.
"The objects intervening between the
eye and the picture are Of natural size.
but carefully chosen as to diameter and
| position; the ground is sloping and the
connection between these real objects and
the picture is so arranged that the en-
semble is not distur bed The spell of the
! illusion might be broken should one step
! directly from the street in front of the
| picture, so that his mind would be filled
| by a lively remembrance of the reality
! without. In such a case it would take
time before the eye accustomed itself to
| the illusion. But rilen you have to pass
through darkened corridors and narrow
! passages, dimly illuminated by artificial
light, before you come into the panorama
proper These changing impressions de-
stroy the last remnant of the scenes of
| reality offered on the street without, and
after the first glance at the picture the
| illusion is complete. Chicago News.
| For Catching Hostile TorpedOes.
wire apparatus has been placed in